function izq()
{
//0
var ranNum= Math.round(Math.random() * 0);
if (ranNum == 0){document.write('<center><br><a href="http://inet.cl"><img src="http://abyb.net/images/logoinet.gif" alt="...mejorando la Internet!!!" border="0"></a><br><br><a href="http://validator.w3.org/check?uri=referer"><img        src="http://www.w3.org/Icons/valid-html401"        alt="Valid HTML 4.01 Transitional" height="31" width="88"></a><br><br></center>'); } // 1izq
}